To clarify, I believe the ratio is stamped on the back of the speedo head in yellow or white ink and preceded by a letter, if my memory serves me correctly, like "M=1200" or similar.
Dan --- LWB250 <[EMAIL PROTECTED]> wrote: > There is your problem in a nutshell. There are > about > 20 permutations of 123 speedos if you include Euro > versions. There is a stamped number on the back > that > will be something like "1200" or thereabouts. This > is > the ratio of the speedo and it must be correct for > your particular application, or, as you have > discovered, your speedo/odo won't be accurate. > > Unlike US cars that sometimes allowed for the > replacement of the gear at the tranny, MB had speedo > heads that were calibrated for the final drive > ratios > and tire sizes. > > Again, give me your chassis number and year and I > can > give you the ratio you need. > > Dan > > > --- hans hansel <[EMAIL PROTECTED]> wrote: > > > I bought this car last June and drove it 600 miles > > home. > > The speedo worked seemingly OK althought the odo > was > > dead. > > This original was a 120mph speedo. > > I went on Ebay and bought an 85 mph speedo that > also > > had a dead odo. > > I rebuilt the odo on this one and installed it. > Now > > the odo turns freely, > > but the speedo reads low. > > > > It never occurred to me that the difference in > speed > > reading from the > > original to the replacement could be due to the > > diff. > > I thought all w123 speedos were geared alike. > > > > It appears I may have to try to resurrect the > > original speedo. > > > > Hans Hansel > > > > ----- Original Message ----- > > From: "Mitch Haley" <[EMAIL PROTECTED]> > > To: "Mercedes Discussion List" > > <mercedes@okiebenz.com> > > Sent: Thursday, January 17, 2008 6:25 PM > > Subject: Re: [MBZ] speedometer > > > > > > > > > > > > > Peter Frederick wrote: > > >> > > >> May be the difference between a turbo and > > non-turbo 300, to. > > > > > > Ah, yes. What was the non turbo, 3.46:1 or so? > > > > > > If the odo and speedo are off by about the same > > amount, I do think > > > there's probably nothing wrong in the speedo > head. > > Either it's the > > > wrong speedo, the wrong tires, or the wrong > diff. > > The tires > > > would have to be way off to make a 4" difference > > in diameter, but > > > 15% seems quite feasible for a diff/speedo > > mismatch. > > > > > > Mitch. > > > > > > _______________________________________ > > > http://www.okiebenz.com > > > For new parts see official list sponsor: > > http://www.buymbparts.com/ > > > For used parts email [EMAIL PROTECTED] > > > > > > To Unsubscribe or change delivery options go to: > > > > > > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > > > > > > _______________________________________ > > http://www.okiebenz.com > > For new parts see official list sponsor: > > http://www.buymbparts.com/ > > For used parts email [EMAIL PROTECTED] > > > > To Unsubscribe or change delivery options go to: > > > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > > > > > ____________________________________________________________________________________ > Never miss a thing. Make Yahoo your home page. > http://www.yahoo.com/r/hs > > _______________________________________ > http://www.okiebenz.com > For new parts see official list sponsor: > http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
